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A sample of a radioactive isotope had an initial mass of 560 mg in the...

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A sample of a radioactive isotope had an initial mass of 560 mg in the year 1995 and decays exponentially over time. A measurement in the year 2002 found that the sample's mass had decayed to 90 mg. What would be the expected mass of the sample in the year 2012, to the nearest whole number?

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